Pilot's Guide

190-00663-02 Rev. B
Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT/GTi
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AUTOMATIC FLIGHT CONTROL SYSTEM
DISENGAGEMENT
The autopilot is manually disengaged by pushing the AP Key on the AFCS Control Unit, or the MEPT ARM
Switch.Manualautopilotdisengagementisindicatedbyave-secondashingyellow‘AP’annunciationanda
three-second autopilot disconnect aural alert.
Figure 7-38 Manual Autopilot Disengagement
Pushingthe AP/YD DISC Switch or YDKeydisengagesboththeyawdamperandtheautopilot.Whenthe
yawdamperandautopilotaremanuallydisengaged,boththe‘AP’and‘YD’annunciationturnyellowandash
for5secondsandathree-secondautopilotdisconnectauralalertisgenerated.
Figure 7-39 Yaw Damper Disengagement
After manual disengagement, the autopilot disconnect aural alert may be cancelled by pushing the MEPT ARM
or AP/YD DISC Switch ( AP/YD DISC Switchalsocancelstheashing‘AP’annunciation).
Automaticautopilotdisengagementisindicatedbyaashingredandwhite‘AP’annunciationandbythe
autopilot disconnect aural alert, which continue until acknowledged by pushing the AP/YD DISC or MEPT ARM
Switch. Automatic autopilot disengagement occurs due to:
•Systemfailure
•Invalidsensordata
•Inabilitytocomputedefaultightdirectormodes(FDalsodisengagesautomatically)
Yawdamperdisengagementisindicatedbyave-secondashingyellow‘YD’annunciation.Automaticyaw
damper disengagement occurs when autopilot disengagement is caused by failure in a parameter also affecting
the yaw damper. This means the yaw damper can remain operational in some cases where the autopilot
automatically disengages. A localized failure in the yaw damper system or invalid sensor data also cause yaw
damper disengagement.
Figure 7-40 Automatic Autopilot and Yaw Damper Disengagement